fix(attack-path): expand the focused endpoint's finding clusters and reclaim hidden columns' width (#6647)

[Seb-MIGUEL]

Description

Two UX fixes on the attack path view, reported from the chokepoint drill-down flow.

1. Focusing an endpoint now opens its findings straight away. Clicking a chokepoint (from the "Top chokepoints" popover, the table, or the search) rebuilt the graph as the focused endpoint path but left every finding-type cluster collapsed — the analyst had to click each one (portscan, files, credentials…) to see anything. The focused view now pre-expands all of the endpoint's finding-type clusters, fed by a single fetchEndpointFindings call split per type (no extra round-trips versus expanding them by hand).

2. The findings drawer no longer truncates the Assets column. FindingList column widths are percentages of the full six-column table. In compact mode the drawer hides three of them, so Type/Value/Assets only used 57% of the row: the asset chips ellipsized while the right half sat empty. The hidden columns' share is now redistributed over the visible ones, keeping their relative proportions. Full-page usage (no hidden fields) is unchanged.

Follow-up to #6964.

Checks

• yarn eslint, yarn tsc --noEmit clean.
• yarn vitest run on the attack-path and findings suites: 27 tests pass.

[github-actions]

/review docs

📖 Docs Reviewer triggered automatically.

2 files changed — 2 functional, 0 documentation.

⚠️ No documentation files modified. Agent will check if doc updates are needed.

[codecov]

Codecov Report

❌ Patch coverage is 41.66667% with 21 lines in your changes missing coverage. Please review.
✅ Project coverage is 44.94%. Comparing base (3e717ad) to head (29cc84f).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ns/simulation/attack_path/SimulationAttackPath.tsx	51.72%	10 Missing and 4 partials ⚠️
...ront/src/admin/components/findings/FindingList.tsx	0.00%	7 Missing ⚠️

❌ Your patch check has failed because the patch coverage (41.66%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.
❌ Your project check has failed because the head coverage (7.59%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6982      +/-   ##
============================================
- Coverage     44.96%   44.94%   -0.02%     
+ Complexity     9327     9325       -2     
============================================
  Files          2681     2681              
  Lines         80441    80477      +36     
  Branches      12066    12073       +7     
============================================
+ Hits          36168    36171       +3     
- Misses        41653    41681      +28     
- Partials       2620     2625       +5     

Flag	Coverage Δ
backend	67.81% <ø> (-0.01%)	⬇️
e2e	17.50% <ø> (-0.40%)	⬇️
frontend	7.59% <41.66%> (+0.04%)	⬆️

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